US Bridges

County HWY 577 over Sturgeon River

Fair

Dickinson County, Michigan · Approx 2 MI S of Vulcan · Structure no. 000000000002200

Built
1969
56 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
160 ft
3 main spans
Daily traffic
761
2021 count
Owner
County
County Highway Agency

About this bridge

County HWY 577 over Sturgeon River is a steel stringer/multi-beam or girder carrying County HWY 577 over Sturgeon River in Dickinson County, Michigan. It was built in 1969, so it is 56 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 761 vehicles a day, roughly 16% of them trucks, projected to reach 800 by 2041. The structure is 160 ft (48.7 m) long and 30 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesCounty HWY 577
CrossesSturgeon River
LocationApprox 2 MI S of Vulcan
RouteCounty Highway 2253
CountyDickinson County
StateMichigan
Coordinates45.7523, -87.86126
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.9 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length160 ft (48.7 m)
Longest span52 ft (15.8 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic761 (2021)
Projected traffic800 by 2041
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County HWY 577 over Sturgeon River built?

It was built in 1969, making it 56 years old in 2025.

What condition is County HWY 577 over Sturgeon River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does County HWY 577 over Sturgeon River carry?

About 761 vehicles per day (2021 count), of which roughly 16% are trucks.

How long is County HWY 577 over Sturgeon River?

The structure is 160 ft (48.7 m) long with a longest span of 52 ft (15.8 m) and a deck 30 ft wide.

Who owns County HWY 577 over Sturgeon River?

It is owned by the County Highway Agency.